The Pololu 3pi robot is a mobile platform which features two micro metal gearmotors, five reflectance sensors, an 8×2 character LCD, a buzzer, and three user pushbuttons, all connected to a C-programmable ATmega328 microcontroller. It is capable of speeds of around 3 feet per second, 3pi is a great first robot for programming beginners and a second robot for those looking to move up from non-programmable or beginners first robot.
This could be programmed as a line follower robot and as a maze solving robot. You could program it for other tasks but these two were the only ones I managed so far. Although it's Arduino, I had to use then the ISP AVR programmer and the AVR program and interface to re-program sketches instead of the easier Arduino 1.0.1. For more info go to: http://www.pololu.com/catalog/product/975
